49 CFR 219.603 : Transportation (§ 1.1 To Parts 1581-1699) — (§ 200.1 To Parts 273-299) — Other Regulations Relating To Transportation (Continued) (§ 200.1 To Parts 273-299) — Federal Railroad Administration, Department Of Transportation (§ 200.1 To Parts 273-299) — Control Of Alcohol And Drug Use (§ 219.1 To Appendix C To Part 219) — Random Alcohol And Drug Testing Programs (§ 219.601 To § 219.611) — Participation in drug testing.

A railroad shall, under the conditions specified in this subpart and subpart H of this part, require a covered employee selected through the random testing program to cooperate in urine testing to determine compliance with § 219.102, and the employee must provide the required specimen and complete the required paperwork and certifications. Compliance by the employee may be excused only in the case of a documented medical or family emergency.